6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <sys/ioctl.h>
36 #include <linux/sockios.h>
42 #include "libsysfs/sysfs/libsysfs.h"
45 #include "udev_version.h"
49 #include "klibc_fixups.h"
51 #define LOCAL_USER "$local"
56 * the major/minor of a device is stored in a file called "dev"
57 * The number is stored in decimal values in the format: M:m
59 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
61 struct sysfs_attribute *attr = NULL;
63 attr = sysfs_get_classdev_attr(class_dev, "dev");
66 dbg("dev='%s'", attr->value);
68 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
70 dbg("found major=%d, minor=%d", udev->major, udev->minor);
77 static int create_path(char *file)
85 pos = strchr(p+1, '/');
87 pos = strchr(pos+1, '/');
91 if (stat(p, &stats)) {
92 selinux_setfscreatecon(p, S_IFDIR);
93 retval = mkdir(p, 0755);
95 dbg("mkdir(%s) failed with error '%s'",
99 dbg("created '%s'", p);
101 selinux_setfilecon(p, S_IFDIR);
108 static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
113 if (stat(file, &stats) != 0)
116 /* preserve node with already correct numbers, to not change the inode number */
117 if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
118 (stats.st_rdev == makedev(major, minor))) {
119 dbg("preserve file '%s', cause it has correct dev_t", file);
120 selinux_setfilecon(file,stats.st_mode);
124 if (unlink(file) != 0)
125 dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
127 dbg("already present file '%s' unlinked", file);
130 selinux_setfscreatecon(file, mode);
131 retval = mknod(file, mode, makedev(major, minor));
133 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
134 file, mode, major, minor, strerror(errno));
139 dbg("chmod(%s, %#o)", file, mode);
140 if (chmod(file, mode) != 0) {
141 dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
145 if (uid != 0 || gid != 0) {
146 dbg("chown(%s, %u, %u)", file, uid, gid);
147 if (chown(file, uid, gid) != 0) {
148 dbg("chown(%s, %u, %u) failed with error '%s'",
149 file, uid, gid, strerror(errno));
158 /* get the local logged in user */
159 static void set_to_local_user(char *user)
164 strfieldcpymax(user, default_owner_str, OWNER_SIZE);
171 /* is this a user login ? */
172 if (u->ut_type != USER_PROCESS)
175 /* is this a local login ? */
176 if (strcmp(u->ut_host, ""))
179 if (u->ut_time > recent) {
181 strfieldcpymax(user, u->ut_user, OWNER_SIZE);
182 dbg("local user is '%s'", user);
189 static int create_node(struct udevice *dev, int fake)
191 char filename[NAME_SIZE];
192 char linkname[NAME_SIZE];
193 char linktarget[NAME_SIZE];
194 char partitionname[NAME_SIZE];
202 strfieldcpy(filename, udev_root);
203 strfieldcat(filename, dev->name);
207 dev->mode |= S_IFBLK;
211 dev->mode |= S_IFCHR;
214 dev->mode |= S_IFIFO;
217 dbg("unknown node type %c\n", dev->type);
221 /* create parent directories if needed */
222 if (strrchr(dev->name, '/'))
223 create_path(filename);
225 if (dev->owner[0] != '\0') {
227 unsigned long id = strtoul(dev->owner, &endptr, 10);
228 if (endptr[0] == '\0')
232 if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
233 set_to_local_user(dev->owner);
235 pw = getpwnam(dev->owner);
237 dbg("specified user unknown '%s'", dev->owner);
243 if (dev->group[0] != '\0') {
245 unsigned long id = strtoul(dev->group, &endptr, 10);
246 if (endptr[0] == '\0')
249 struct group *gr = getgrnam(dev->group);
251 dbg("specified group unknown '%s'", dev->group);
258 info("creating device node '%s'", filename);
259 if (make_node(filename, dev->major, dev->minor, dev->mode, uid, gid) != 0)
262 info("creating device node '%s', major = '%d', minor = '%d', "
263 "mode = '%#o', uid = '%d', gid = '%d'", filename,
264 dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
267 /* create all_partitions if requested */
268 if (dev->partitions > 0) {
269 info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
271 for (i = 1; i <= dev->partitions; i++) {
272 strfieldcpy(partitionname, filename);
273 strintcat(partitionname, i);
274 make_node(partitionname, dev->major,
275 dev->minor + i, dev->mode, uid, gid);
280 /* create symlink(s) if requested */
281 foreach_strpart(dev->symlink, " ", pos, len) {
282 strfieldcpymax(linkname, pos, len+1);
283 strfieldcpy(filename, udev_root);
284 strfieldcat(filename, linkname);
285 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
287 if (strrchr(linkname, '/'))
288 create_path(filename);
290 /* optimize relative link */
291 linktarget[0] = '\0';
294 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
295 if (dev->name[i] == '/')
299 while (linkname[i] != '\0') {
300 if (linkname[i] == '/')
301 strfieldcat(linktarget, "../");
305 strfieldcat(linktarget, &dev->name[tail]);
307 dbg("symlink(%s, %s)", linktarget, filename);
309 selinux_setfscreatecon(filename, S_IFLNK);
311 if (symlink(linktarget, filename) != 0)
312 dbg("symlink(%s, %s) failed with error '%s'",
313 linktarget, filename, strerror(errno));
322 static struct sysfs_class_device *get_class_dev(const char *device_name)
324 char dev_path[SYSFS_PATH_MAX];
325 struct sysfs_class_device *class_dev = NULL;
327 strfieldcpy(dev_path, sysfs_path);
328 strfieldcat(dev_path, device_name);
329 dbg("looking at '%s'", dev_path);
331 /* open up the sysfs class device for this thing... */
332 class_dev = sysfs_open_class_device_path(dev_path);
333 if (class_dev == NULL) {
334 dbg ("sysfs_open_class_device_path failed");
337 dbg("class_dev->name='%s'", class_dev->name);
343 static int rename_net_if(struct udevice *dev, int fake)
349 dbg("changing net interface name from '%s' to '%s'", dev->kernel_name, dev->name);
353 sk = socket(PF_INET, SOCK_DGRAM, 0);
355 dbg("error opening socket");
359 memset(&ifr, 0x00, sizeof(struct ifreq));
360 strfieldcpy(ifr.ifr_name, dev->kernel_name);
361 strfieldcpy(ifr.ifr_newname, dev->name);
363 retval = ioctl(sk, SIOCSIFNAME, &ifr);
365 dbg("error changing net interface name");
371 int udev_add_device(const char *path, const char *subsystem, int fake)
373 struct sysfs_class_device *class_dev;
375 char devpath[DEVPATH_SIZE];
379 memset(&dev, 0x00, sizeof(dev));
381 dev.type = get_device_type(path, subsystem);
383 class_dev = get_class_dev(path);
384 if (class_dev == NULL)
387 if (dev.type == 'b' || dev.type == 'c') {
388 retval = get_major_minor(class_dev, &dev);
390 dbg("no dev-file found, do nothing");
395 if (namedev_name_device(class_dev, &dev) != 0)
398 dbg("name='%s'", dev.name);
404 retval = create_node(&dev, fake);
407 if ((!fake) && (udevdb_add_dev(path, &dev) != 0))
408 dbg("udevdb_add_dev failed, but we are going to try "
409 "to create the node anyway. But remove might not "
410 "work properly for this device.");
412 dev_d_send(&dev, subsystem, path);
416 strfieldcpy(devpath, path);
417 if (strcmp(dev.name, dev.kernel_name) != 0) {
418 retval = rename_net_if(&dev, fake);
421 /* netif's are keyed with the configured name, cause
422 * the original kernel name sleeps with the fishes
424 pos = strrchr(devpath, '/');
427 strfieldcat(devpath, dev.name);
430 if ((!fake) && (udevdb_add_dev(devpath, &dev) != 0))
431 dbg("udevdb_add_dev failed");
433 dev_d_send(&dev, subsystem, devpath);
440 sysfs_close_class_device(class_dev);